Remove CDI extension from drools-compiler

CDI extension should be removed from drools-compiler [1] as it doesn't belong to core artifact. It can cause issues when deploying on various application servers like on WebSphere using Kie server - see attachment.

[1] https://github.com/droolsjbpm/drools/blob/7.0.0.Beta6/drools-compiler/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension